My '14 JGC Summit Diesel with 17k miles makes a very very high pitch noise. My dealer assures me it is normal. I don't agree because this noise only appeared at 12k miles. Now that I am aware of the noise it drives me nutz especially when the car is stopped at a traffic light. My wife can hear the noise the describes it as a whirring noise. To me its just a high pitch noise that should not be there.